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Due to the increase in demand, there is not enough supply to meet the demand . This is evident from "concerns are growing that the flagship smartphone will be in very short supply for its Nov. 3 launch and months after."

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as seen from the demand and supply curves, buyers and sellers behave exactly opposite from each other with respect to changes in the price  of the good

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whenever a new phone is released, the phones that were produced before will decrease in price.

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for the demand of iphone x, when the price increases, the demand for iphone x decreases, showing the inverse relationship between quantity demanded and price.
All told, 64% of prospective  iphone buyers want either an iphone X or iphone 8 series phone, compared with 71% who wanted the iphone 7 series phones in last year's survey.

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if sellers decide to increase the price of iphone x, the demand for iphone x will decrease. however, we do not know how much less iphone x will be bought.
the demand for iphone x is price elastic as buyers respond to the change in price.

according to the non-determinants of price elasticity, the demand for iphone x drops due to necessity vs. luxury. the price of iphone x keeps rising and some people find it unnecessary to upgrade to iphone x as it is not a need. due  to  the availability of substitutes, many people choose to buy phones of other brands rather than iphone x as it is more expensive.